Gas eliminator



Nov. 21, 1944.l R. M. LINDGREN GAS ELIMINATOR Filed Sept. 22, 1941 `3Sheets-Sheet l INVENTOR. BY ROBE/P7' M. M25/PEN 3 Sheets-Sheet: 2

GAS ELIMINATOR R. M. LINDGREN Filed Sept. 22, 194;

Nov. 21, 1944.

Y' INVENT OR.

Nov. 21, 1944. R, M, UNDGREN 2,363,343

' GAS ELIMINATOR Filed Sept. 22, 1941 3 Sheets-Sheet 3 y tially filledwith gas.

Patented Nov. 21, 1944 L'JNrrloy `sfn rr13sl PATENT OFFICE 'Robert M.Lindlgrrcn, Detroit, Mich., assignor lto t'roit, Mich., a corporationDeep Wells, Inc., De

of MichiganA A' Application september 22, 1941, serial N0.f411,s77

12 Claims. (c1. 10s- 20%)rv e My invention relates to a. new and usefulgas eliminatoradapted for use primarily on oil wells.

In a very common type of oil well pump a tubular member is providedwhich is reciprocated and carries a valve knownA as atraveling valve.-Below the traveling valve is a stationary valve and the construction ofthese parts is such, and these valves are so constructed and arranged,that when-the tubular reciprocating member moves,

downwardly thevtravelingvvalve opens and alV standing valve below movesinto open position allowing liquid to flow into the chamber above thestanding valve.- Where gas is present frequently-thewspace between thetraveling valve and the standing valvel becomes vfilled or par- When thetubular member is forced downwardly the traveling valve isheld on theseat bythe amount of'` liquid positioned above. When the space below isfilled with liquid the pressurefof the liquid is-suflicient to lift thecondition /exists lthe pumping of liquid by 'fthe pump ceases and thus,what is commonly known as av gas lock has developed.`

'It is an object of Ythe present invention toy pro- .vide a pumpstructure so arranged as, to eliminate and obviate such a situation andprevent the formationr of a gas lock.

It is another objectof the present invention'to provide a structurewhereby, upon the'downward movement of thetraveling valve apre-determined distance, a liquid will be permitted to flow into thechamber between the traveling valve and the standing valve so as toforce the gas out of the gas filled pump chamber.

It is another object of the present invention to provide, in a pumpingmechanism having a Apump chamber associated with a reciprocating part amember telescoping with the reciprocating part and vso arranged andconstructed that upon a pre-determined positioning of the reciprocatingpart and the telescoping part, 'liquid-may be permitted to flow from theexterior -of these parts into the pump chamber.

It is another object of the present invention to provide in a pumpstructure of this type a means for eliminating or preventing theaccumulation of a compressible uid in the pump chamber.

`Another object vof the invention is the provision in a pumpingmechanism of this type, of meanswhereby a'compressible uid entering thepump chamber may be displaced with a liquid.

In some types of oil wells, the well is placed under a vacuum for aperiod of time in order to draw the oil from surroundingrterritory intothe basin of the well. In such vcases when the pump becomes drained ofall uid the standing valve and. traveling 'valve lare locked in closedpositions, the traveling valve being held in closed position by thefluid above, and the standing valve being held in closed position by avacuum. It is an'object of the;present invention to `provide a pumpingmechanism so constructed and arranged that when operated toapredetermined position such a vacuum will be eliminated.

It is another object of the present invention to provide a pumpstructure, that, regardless of the pump space, will function efficientlyand produce maximumvolume `of flow.

It is an object of the present invention to provide a pu'mp structurehaving a reciprocating member and a member telescoping therewith andadapted for traveling in unison therewith and so constructed andarranged that saidmember will be hydraulically balanced when immersed *Yin liquid. y y y l Another object of the invention is the pro-- visionof a pumping mechanism having a reciprm eating part and a parttelescoping therewith and movable in unisonfth'erewith so arranged andconstructed as to prevent said members becoming hydraulically locked inlfixed relationv when immersed in the liquid to be pumped.

Another'object of the present invention is the provision of a pumpstructurev so arranged, that it'will vlend. itself to vuse with linersor without liners placed inside' the working barrel thus makingit-possible to regulate the pump volume of flow, and therefore theoverhead load, to the capacity range of the pump operating machinery.

' Other objects will appear hereinafter.

It is recognized that various modifications or changes may be made inthe detail of structure illustrated without departing from the spirit ofthe invention and it is intended that such variav tions andmodifications shall be embraced within the vscope of the claims forminga part hereof.

Forming a part of this specification are drawings in which,

Fig. 1 is a fragmentary, longitudinal, sectional view of the invention.

Fig. 2 is a fragmentary, central, longitudinal sectional view of theinvention with parts broken away and illustrating a continuance of thestructure shown. in 1` with intermediate parts removed.4

Fig. 3 is a sectional view taken on line 3-3 of Fig. 1.

Fig. 4 is a sectional View taken on line 4-4 of Fig. 1. i

Fig. 5 is a view similar to Fig. l showing. the pump in its reverseposition of movement..

Fig. 6 is a view similar to Fig. 2 showing the pump in its reverseposition of movement.

In the structure illustrated in Fig. 1 and Fig. 2, I have indicated ananchor shoe 35, having an inclined seat 36 formed thereon against whichmay seat, in sealing relation, the corneal head 31 carried on the lowerend of the pull tube 38. The upper end of this pull tube 38 carries alitting 39 which has bore 4l formed therethrough in alignment with thebore. 4,2. formed in the plunger 4U which is threaded' at.r its lowerend to the upper end of the iitting 39 and at its upper end to the valvecage 43. The upper end of the plunger 40 serves to press the Valve-seatforming ring 44 into position on and secure it in position on the valvecage 43. A ball valve 45 is po- Fig. 7 is a sectional view taken onli'ne 1--1- of Fig. 5. y

Fig. 8 is a sectional view taken on line 8-8 OfFig. 5.

Fig. 9 is a longitudinal; central', sectional, fragmentary view of'asli'ghtly modified form of' the invention.

Fig; 10 is a central, longitudinal', sectional View showing acontinuance off the'v structurev illustrated in Fig.Sl'withintermediateAv partsI removed and with-partsbroken a-Wayi Fig. 11is a sectionalview taken on line |`IH of Fig. 9*. f

Fig. 12 is a sectionalview taken on ll'ne IZ-I2 of Fig; 9.

Fig. 13 i'sv a longitudinal, cent'ral, fragmentary sectional View'illustrating a modified form of structure.

Fig. 14` is a sectional View taken on line I4--I4 ofFig. 13.

Fig; 15n is asectional viewf taken on line I5--l`5 of Fig; 13. f

Fig. 16 is asec'tional view taken on line lB--IB ofFig. 13'.

Fig. 17 is a sectional view taken on line IT--ll of Fig. 13`.

Fig.A 18 is a longitudinal, central, fragmentary sectional view of afurther modified" form of ,of Fig. 18.,

Fig. 22 is al sectional view taken. on line 22-22 ofLFig. 18.V

Fig. 23 isa sectional-view taken online 23-23 of Fig. 18.

Fig. 24 isa sectional View taken onL line 24-24 of Fig. 19.

Fig.. 25.vv is. a fragmentary, central, longitudinal, sectional view ofa.- further modification.

In thev structure illustrated in. Fig... l.l and Fig. 22,Y I. haveindici-used v the pump and. its. working partsin theposition which.they. would. assume when the upwardstroke isy being made. In Fig. 5 andFig. 6, Il have illustratedthesame pump structure with. the working.parts4 the. positionswhichv they would'.v assume whenmaking the downwardstroke and when. gashas. been encountered. Ifv gashadnot.beenencountered, the ball valve 64 in Fig..5.would. be inelevated position, permitting the liquidto. flow. through the opening inseat63.

"flowof' liquid' through the plunger.

sitioned inthe cage43 and adapted, when resting ori-the seat44ato serveas a closure for the upper end of the plunger 40 and prevent downward Itwill be noted. that this typeof structure embodies a stationary plunger.Some pumps have a moveable plunger and a stationary barrel. Thetraveling valve used in thes'efpumps is carried by the moveable partwhether it is the pump barrel or the plunger.v In the structure'illustrated the ball valve- 45 may be termed the standingv valve.

The pump plunger 40i snugly engages as a slidable tin. the pump barrel46"' which carries the engagement nipple 41'at' itsk lower end and whichis connected at itsiupperv endl to one end of a fitting 48. Connected"to' the upper end of the fitting at its lower end is the tubular member49V having itsupper end increased in thickness as 54', and provided withth'e inclined bearing surface or' engagement shoulder54'.Slidably'engagingas snug'iit'in the tubular member 49, is a lifting tube511Y having the upperl end reduced in outside diameter to provide theconstricted portion Y ortube 52A and thus form the engagement shoulder53 adapted for.' engaging theinelined bearing or engagement surface'54'. Thek bore through the tubing 49 is reduced in diameter by athickened portion 54"t`o provide the constricte'd' bore 55 in which thereduced portion 52 of themember 50 slidably engages in ai snug fit.

The inner surface of the portion 54' is cut away, intermediate'its ends,to provide the circumferential? inner channel' 51 whichY extends aroundthe portion 52 and which. communicates through the openings 58* with theinterior of the tubing 341, and which is: adaptedr to communicate withthe openings'59'formed in the reduced tubular portion 521 They upper endofthe tubular' portion 52 is provided. with a lockk nut 6D andA threadedinto one endr of the-fitting 62 and serves to press against and retainin positionthe; annular seat-forming member 63 which serves as a seatforthe ball valve 64`. This valveis the traveling valve. Prothe downwardstroke, the` valve 45 would move into closed positionand the valve 64would open permitting the.. pump chamber to be cleared of 'garded bemade of extraordinary length the difference pumpbarrelwould remainstationary until the lock -nut 60 contacts 'the member 54 at its upperend whereupon the` pump barrel and the ,member 65 wouldmove in unisonwith each other,

the member`52 and the member 50 telescoping I'with the pumpvbarrel49until the lock nut 69 engages the upperv end of the portion 54. .On theAupward movement these parts 49 and 50 would Amove relative to eachotheruntil the faces 53 and 54 engage. f For an eiicient operation of ever,it is necessary that the pump barrel be hydraulically balanced.'Experience has shown that the difference in'theliquid pressure'atopposite ends of the pump barrel due to the length of the pump barrel isnegligible and may be disre- If,fof course, the pump barrel should inpressure would have to be taken into account; If the pressure on ltheupper end of the pump `barrel 49 should be greater than the pressure onthe lower end ofthe pump barre] the tendency would be to maintain themember 59 in the position shown lin Fig. 1, so that the engaging facesmust be maintained within certain limits due to a desire to reduce theWeight as much as pos- @sible and obtain the desired bore. An examina-'tion of Fig.V 1 .will indicatethat the lower end Sof the pump barrel 49is of lessthickness than the upper end or thickened portion 54'. 'I'hisdiierence in thickness is accounted for by the formation of the shoulderand bearing face 54 and in this manner a true balance of the pump barrel49 is obtained. l

In operating, as the member 52 moves downwardly so as to telescope withthe-pumplbarrel 49, the openingsA 59 will move into registration withthe openings 58. By having the inner surface of.the member 54f'cut awayas at 5'! to provide the internal channel, the openings 59`will` be incommunication with theopenings 58 when v'registering with the channel51,l regardless of these parts, howf .The liquid `entering the pumpchamber through the openings .58 willthus establish a liquid pressureinthe pump chamber equal to the liquid pressure in the tubing 34. As thepump barrel is moved downwardly the liquid therein` will be .subjectedto additional pressure suflicient to lift the ball valve 64 off its seatand the liquid in the pump chamber will'b'e permitted to escape throughthe valve seat 63 and through the openings 58 and 59, this liquidcarrying with it anyy gas which may have accumulated in the pump.

barrel. The same action would effect a breaking of avacuum which mayhave been established in the pump chamber through subjecting the wellrelative rotation of the member 52 and the pump barrel 49. lWhen thedownward stroke is being made, that is, when the lock nut` 60 isinengage'- ment with the end of the portion 54', the openings 59 will bein registration with the channel 51 thus establishing communication ofthe interior of the pump'chamber or pump barrel 46 with the interior ofthe tubing 34. This will permit the liquid which is standing in thetubing 34l the forming of la vacuum in the chamber 46. It is, of course,obviousV that the chamber 66 is sealed at itsop'posite ends by therengagement of the member with .the inner surface of the member 49 insealing relation and byengagement of lthe member 50 in sealing relationwith the inner surface of the member 54.

to vacuum pull over a period of time.

The engagement faces of the members 54 and B0 should previously beground rough and in Fig. 9, I have indicated the engaging face of member6I', which functions as a stop member in the manner of the member 60, asprovided with a groove. The purpose of having these engaging facesroughene'd is to prevent the parts becoming locked by virtue of thepressure which may `surround them,-whether it is air or liquid. In thisway when the upward stroke begins from the position'shown in Fig. 3 theparts '60 and 54' are readily disengaged. l i

In this manner I have provided a pump which is hydraulically balanced,and in which the formation of 'a gas lock or vacuum is prevented.

In Fig. 9 and Fig. 10, I have indicated a structure correspondinglargely to theA structure illustrated in Fig. 1 and Fig. 2.Corresponding parts are designatedin Fig. 9 and Fig. 10 andthe sectionstaken thereon with reference numerals corresponding to the similar partsin the structure illustrated in Fig. 1 and Fig. 2, the correspondingreference numerals in Fig. 9 and Fig. 10 being indicated as primenumbers.

The member 6| .f which corresponds to the member 6| of Fig. 1 serves asa contact member, the lock nut being eliminated. This member 6| isprovided on its face with the groove 60 for engaging the upper end ofthe member 54"' f' which corresponds to the member 54 of Fig. 1.

Formed preferably integral with the member l the ring 68 as at 69 toretain this ring in position.

The member 41 corresponds to the member 41 of Fig. 2. This memberthreadsinto one end of a fitting 19. The opposite end ofvthis fitting'luthreads intothe lower end of the pump barrel 46'. Thus in thestructure illustrated in Fig. 1.0 there is a departure from thestructure illustrated in Fig. 2, accomplished by using the ltting 19. isresorted to in orderthat the liner sections 1I may be easily and quicklyinserted in position. These liner sections abut against one end of thefitting 48 and are engaged by oneend of the tting 19. lThe purpose ofusing the liners is to reduce the sucker rod load f and provide a finerbarrel finish. This reduction in the load is accomplished by reducingthe volume capacity of the pump. It will be noted that the' openings 56shown in Fig. 1 are notpresent in the structure shown in Fig. 9.Otherwise the structure illustrated in Fig. 9 and Fig. 10 is similar tothe structure illustrated in Fig. 1 and ,provided with .axial openings|07..

.21 the vintious`r features and functions andresults of' the structureillustrated in Fig. V1 and Fig. v2 are present .in thestructureillustrated Ain Fig. 9 and Fig. lO.

In. Fig'. .13,1 havev .illustrated a fragment of a pump which thevstructure is slightly modified trom .that already described. The valvecage 'l2 :ist provided with e, threaded stem 7'3A for `atta-ch- -ment tothe sucker' rod. Positioned in the valve cage H2' is theI .ball valve'|4- tting on the seatforming .ring |15 which is held in .position byone enli. ci 'the ii'tting |6'. Threaded into the opposite yendvofftluz- -fitting 'l5 is the pipe Tl carrying the lo'ck nut 18.lSilidably mounted on the pipe 11 is the barrel 8T carrying the topportion 19. This Ibarrel .ann this top portion 1B will be vtree to ro-.ta'te Aon the pipe l'l or may .be secured against `rotation while atthe `same time-permitting longitudinal relative movement. Formed in thetube 3 9 arey openings 80whi'ch correspond to the openings r59^ofFig. 1. The lower endo-f the tube 11 is formed vinto 'a piston,cutaway-as at 83 to provide aciearance or :channel-communicating withthe `vent open-ings 86. This .portion is alsoI provided with-grooves :inwhich may bel positioned pack- 'o1-:sealing rings 85. This structure isillustrated and may be resorted to when it 'is desired to compensate formis-.alignment `of the parts 19 and 8f? whenv threaded together. Whenthis structure is resorted to, a iinely machined` t between `engagingsurfaces .oi the member 11 and the pumpparrel -BFI is not required asthe expanding packing r.or 'sealing 'rings 8-5v would ycompensate `for.any roughness 'in machining which might be present. A

InFig. 18 and Fig.. i9, 15h-ave illustrateda modification `ofthei-nventi'on :and in these views I have illustrated an anchor 'shoe'88 having an inclined seating surface 89 against whichengages theconical surface y9J oi the lhead 90 which is connected at its upper :endto the valve cage 93 vhaving the inwardly projecting shoulder`9l`against which t'h'e seat-forming ring wisheld .by the `end of the lhead90; Alball valve 496 is lpositioned in the cage 93. .Apin 98 .isextended diametrically through the cage 93. A'nipple 9J on the upper endof cage 93 threads into one end 'of ya `coupling 99, the

4other end of which threads into the lower end of the pump barrel |.0|.Thus `the `pump barrel is mounted stationary. Liner sections |02 are.mounted within the barrel Threaded into the upper end of the barrel|0.| yis one end of a -tting Iiiwhich-engages one of the end sections`of the .liner |02, the other .end section engaging an yend of vthecoupling 99. Positioned in the iitting |03A .is a guide .ringl04 whichv.projects through the .head |05 .threaded into the upper end of thefitting |03. This head |05 is provided with lateral openings |05 and thering .|04 is Slidably projected through the head |05 .and .the guidering L04 is a, rod |08 which connects to the upper end of valve cage |09.in which is positioned the ball valve l l0 adapted to rest upontheseat-form- .ing ring lli. This-ring .is engaged .by one end of' theconnector ||.2 which is threaded into the lower end of the valve cage|09 .and which also threads onto the plunger extension tube H3. A

lock nut ||4 is threaded onto the tube H3. Em-

bracing the tube I3 and slidable relatively thereto, withinpredetermined limits, and slidable in unison therewith is a sleeve |5.Laterally direct- .ed Openings I'B 'are formed in the tube ||3 andadapted., when the locknut n| |4 engages the Iupper end nof the sleeve||5, .for registering with the openings 1H .formed in the sleeve H15 andfor communicating. with the peripheral channel |1|8 extending around thetube I |.3. Anaxially directed passage ||9 communicates at one endA withthe groove or channel ||f8 and at its opposite end with the groove orchannel H8 shown in Fig. L9. The tube I3 may be termed the plunger tubeinasmuch as it is formedy at its lower end with the piston-like plunger|20 having the peripheral grooves |2| formed therein for receivingsealing or packing rings. The meeting faces of members H4 and ||5 arefinished rough so that an atmospheric or hydraulic. locking of thesefaces together is' prevented.

In= operation, theV rod |08, tofwhich is connected thesucker line, isIreciprocated so as toreciprocate the plunger in the stationary pumpbarrel |0| ispositioned .in spaced relation to the tubing34" towhichtheanchor shoe 88 is connected. As vthe rod |08. moves Vdownwardlythe lock nut IM, through engagement with the upper end of rthe sleeve l|I5, will force this `sleeve to travel in unison with the tube ||3afterthe openings ||6 .have been brought intoI registration with theychannel or groove H8. When this registration is eilfected the vgas lockor vacuum, herein previously referred to, `will be eliminated and thesleeve l5 will be in hydraulic balance, the liquid being. permittedaccess tothe lower end of the sleeve ||5 through the passage I9.. As theplunger is .forced 'downwardly the liquid will be forced upwardlythrough the bore of the plunger and through the plungertube -I i3forcing the valve |-I'0- ofi' its seat, the liquid traveling upwardlyand .having access to the `well tubing 34. through the opening |06...`In this .movement the ball valve 9B will be resting upon its seat. Inthe reverse movement the ball 96- will be lifted from its seat. The:sleeve ||5-and the tube ||3 will be moved tothe relative positionsshown in Fig. 18, and the ball valve I0 will rest upon its seat.

Itis yobvious that .a prevention. of a .gas lock a well of vthis type isaccomplished in substantially the same manner as previously Vdescribedfor .the other forms. Anyone skilled in the art will understand that thepump barrel may be anchored either above or below.

In Fig. 25., I have indicated a structure in which the ball valve 14,illustrated inFig. 13, is eliminated, andthe upper end'of the iitting T9corresponding to the tting :'IE of Fig. 13 is closed by a `disc |60mounted within the cage 16| from which .extends the threaded ynipple |82rfor attachment -to the sucker rod. In such a-structure the liquid.pumped would have access -to the lwell tubing through the openings 81|illustrated in Fig. 13. Experienceha's shown that -this structure isoperi ative --so that the traveling valve may thus be veliminated whendesired. This structure is particularly adaptedwhere the lpumpingmechanism -is operated .atslow speed. It isobviousthat in all :of thestructures illustrated, the 4parts may -be easily and quickly .assembled.and disassembled. Another feature which is :obvious is the kcompactnessand lightness of the device. The structures .also are such ,as to lendthemselvesto a production method of manufacture. i l

In operation the `pump would ordinarily be ,immersed in liquid. This istrue whether. the pump ordinarily is positioned immersed in the liquidor is .positioned well above the liquid to be pumped.

lWhen positioned Well above -the liquid to be pumped, the .liquid willbe discharged from the I .upper cndof the pump and A graduallyufill thes Well 'tubing toa .level whichisabove ,the pump. Qrdinarily. a gastlock.. would not` develop in a pump until the column of liquidabove thepump exerted pressure on the traveling valve suicient to counter-balance the compression of the gas within the .pump chamber. y

,It WillbenOted that1the breaking of the gas lockV brieiiy v,consists inbleeding a liquid from aroundthe pump into the interior or into the pumpchamber between thetraveling Valve and standing valvewhich may be termedthe end valves of the pump., .-'Ihis bleeding is accomplished on theout-putstroke of the pump and the bleeding ports are v closed on Vthein-take stroke ofthe pump.

y WhatIclaim asnewis: i v1.,-In a pump mechanism. ofthe classn,described, adapted for operation while immersed in liquid, a -pumpbarrel having a liquid receiving chamber therein;` avtubular plunger,said plunger land said barrel being associated in telefA` dinally oileach other; `a valve mechanism at each end of said chamber'foropeningand closeA ing the sameJ said valvesgbeing arranged sorthat one valve isopen When the other is closed and vice versa; and means lfor ,bleeding aliquid .into said chamber through saidplunger between said valvemechanisms during movement of the barrel-in one direction and preventingbleeding duringm'ovementof the barrelin the opposite direction.

3.1n a pump mechanism of the class described, adapted for operationWhile immersed in liquid, a pump barrel; a tubular plunger intelescoping relation with said barrel; a valve in said tubular plunger;a tubular extension on said barrel; lateral openings in said extension;a tubular member telescoping saidbarrel lextension; lateral openings in`said last-named tubular member and'communicable with the lateralopenings in said extension; and a valve at the end of said last-namedtubular member, said valve being adapted to remain open When saidrst-namedvalve is closed and vice versa.

4. A pumping mechanism embodying a pair of telescoping reciprocabletubular parts; one of said parts constituting a pump barrel and theother constituting a plunger; an oil conduit in said parts; valve meansfor closing the ends of said tubular parts; a tubular extension on oneof said tubular parts; a tubular member telescoping said tubularextension and reciprocable with respect thereto; a valve for closing oneend of said last-named tubular member; and lateral openings in saidlast-named tubular member and named member, saidL tubular members 'beingarrangedfin telescopic relation .at one of their ends,

and adapted vfor. slidable longitudinal ,relative` movement, the`interior vof 4one tubular` member communicating with the interior ofthe. other;

means for bleeding liquid into'y the :interior oi' said members upontelescopic movement of said members in one directionto a predeterminedposition; and means v'for limiting the relative longitudinal movement ofsaid members.

Q6. In a pump mechanism of the class described, adaptedfor operationwhile immersed in liquid, a pair of .tubular sections, said sectionsbeing arranged at one of their ends in telescopic relation, slidablelongitudinally'of1-each other, one of said sections comprising apump-barrel and the other of `said sections comprising a plunger; a pairof valves, there being a valvey at one end of veach of said' sectionsforclosin'g the samethe first section having lateral openings formedtherethrough in communication With the liquid in which it4 is immersed;a third tubular section slidaoly engaged in said iirst section andhaving lateral openings formed therethroughand communicable with theopening `of the rst section,

said lateral openings being adapted for communication With the openingsin said rst section upon movement of said third section to apredetermined position relative to said first section.

being'adaptedfor communication 'with the open-v ings in said firstsection upon movement of either section to a predetermined positionrelative to said other section; and means carried by one section forengaging said other section upon alignment of said openings therebyforcing said other section to travel in unison with said first section.

8. In a pump mechanism of the class described,

adapted for operation while immersed in liquid,

a pair of tubular sections, said sections being arranged at one of theirends in telescopic relation slidable longitudinally of each other; aplunger `in one section; a pair of valves,l there being a valve at oneend of each said sections for closing the same, one of said sectionshaving lateral openings formed therethroughv in communication with theliquid in which it is immersed; lateral'openings in said other sectionbeing adapted for communication with the openings in said iirst sectionupon movement of said second section; means carried by said secondsection for engaging said rst section upon alignment of said openingsand thereby forcing said first section to travel in unison with saidsecond section and means for moving said sections in unison uponmovement of said first section in the opposite direction out of openingAaligning position a predetermined distance. y

9. In a pump of the class described, adapted for operation Whileimmersed in liquid, a pair of tubular sections-arranged at one of theirends in telescopic longitudinally slidable relation, one of saidsections forming a pump 'chamber vand the other of said sectionsforminga tubular plunger communicating with saidV chamber; valves forclosing the ends of said sections; "means for anchoring one of saidsectionsstationary; areciprocating mechanism; a floating connectionbetween said `reciprocating kmechanism and the other of saidsectionsalignable ports'in `said reciprocating mechanism and said oating'connection, said floating connection being arranged for moving one ofsaid sections in lunison with sai-d reciprocating mechanism'in eitherdirection, subsequent to themovementlof 'said reciprocating mechanism apredetermined distance in either direction; and means for 'maintainingthe-reciprocated section in hydraulic balance in the liquid in which itis immersed. y

10. In a pump structure'bf thieclass described, adapted for operation'Whileimmers'e'd in liquid, 'a pair bfi tubular 4sections arranged at"one f` their ends in telescopic -longitudinal-1y rslidab-ie "relation,one ofsaidse'cti'ons providing a pump barrel and the other 'of 'saidsections providirrga plunger; a travelin'g'va'lv'e on the upperend of'said barrel Vstructure 'for j'preventirrg return flow of liquid intosaid barrel; a'valveon the lowerei'id of said 'barrel structure forpreventing kreturn now lf'liquid fromsaid barrelfsaid barreis'ectionhaving, Jbetween said valves, openings for communic'atingtheinterior'thereof with the liquid in which it is immersed; a thirdsection telescoping (said Afirst sect'ivo'n "and having means formedtherein for registering with the openings in said iirst'sectionupon'movementof said third section toa predetermined position land meansfor closing communicationpf the 'interior cfsaid first a'nd thirdsectionswith theliquidinwhch itis immersed. y j

11. `In a pump 'structref ofv the class described, adapted forAoperation'vvhile'immersed in liquid, apair 'of tubular"sectionsarranged'at one lof theirends in telescopic longitudinally siidable relationtoprovide a chamber; a-traveling valveat the upper 'end of one'ofsaidsections'ior preventing return ii-ow of liquid into said chamber; favalve at the lower end of the `other section for preventing return flowof liquid l"from said cham-4 ber, 'one of 'said sections having, betweensaid valves, openings for communicating the interior thereof with theliquid -in whichit -is immersed; one of said sections telescoping theother and longitudinally movable relatively lthereof and having openingsformed therein for registering with `said cpenings'in said chamber uponmovement of -said sections to 'a predetermined position; means formovi-ng 'said 'sectionsf out of said predetermined position and forclosing 'communication of the interior `of sai-d chamber with the liquidin which it is immersed; and means `for maintaining said tubular memberiin hydrostatic balance in said liquid and preventing vacuum lockbetween the said -sections and said tubular member.- 't

12. In Aa `pump structure'of the `class described, adapted for operationwhile immersed vin liquid, Va pair of tubular sections arranged intelescopin'g longitudinally Vsl-ida'ble relation; one of said sectionsproviding a tubular plunger and the other of said sections providing apump barrel; -a valve for preventing return riiow of liquidin'to 4saidbarrel from Aone end; Aa valve 'for preventing return flow of liquidfrom said barrel :at its opposite end, said barrel sections havinglateral openings formed therethrough between said valves forcommunicating 4said barrel Awith thel-iquidin which it is immersed; atubular member telescoping and longitudinally sl'idable insaid barrelsection and having openings ladapted `for registering with the openingsin `said barrel section upon movement ofsaid'sec'tion to a predeterminedposition relative to said tubular member; finterengaging means betweensaid last-named member and said barrel section vfor effecting "amovement of the same in unison with each other upon the registration ofsaid openings; andmeans for disengaging said interengaging parts.

ROBERT M. LINDGREN.

